EP0248821A1 - Detector of the inflation pressure of motor vehicle tyres. - Google Patents
Detector of the inflation pressure of motor vehicle tyres.Info
- Publication number
- EP0248821A1 EP0248821A1 EP86906285A EP86906285A EP0248821A1 EP 0248821 A1 EP0248821 A1 EP 0248821A1 EP 86906285 A EP86906285 A EP 86906285A EP 86906285 A EP86906285 A EP 86906285A EP 0248821 A1 EP0248821 A1 EP 0248821A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tire
- pressure chamber
- reference pressure
- pressure
- membrane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000012528 membrane Substances 0.000 claims abstract description 31
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 125000006850 spacer group Chemical group 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- HUWSZNZAROKDRZ-RRLWZMAJSA-N (3r,4r)-3-azaniumyl-5-[[(2s,3r)-1-[(2s)-2,3-dicarboxypyrrolidin-1-yl]-3-methyl-1-oxopentan-2-yl]amino]-5-oxo-4-sulfanylpentane-1-sulfonate Chemical compound OS(=O)(=O)CC[C@@H](N)[C@@H](S)C(=O)N[C@@H]([C@H](C)CC)C(=O)N1CCC(C(O)=O)[C@H]1C(O)=O HUWSZNZAROKDRZ-RRLWZMAJSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/26—Details
- H01H35/2671—Means to detect leaks in the pressure sensitive element
Definitions
- the invention relates to a tire pressure sensor for motor vehicles according to the preamble of the main claim.
- a tire pressure sensor for motor vehicles according to the preamble of the main claim.
- the pressure switch there consists on the one hand of an electrically conductive membrane, which closes a reference pressure chamber towards the tire, and on the other hand consists of a contact, which is melted into the glass pressure bushing in an electrically insulated manner in the reference pressure chamber and on which the middle area is closed to close a circuit the membrane attaches to the tire with sufficient air pressure.
- the reference pressure chamber is filled via a duct with air or nitrogen to a desired reference pressure, and then closed pressure-tight.
- the reference pressure is selected so that when there is sufficient air pressure in the tire, the membrane lies against the end of the contact pin.
- the air pressure in the tire drops a minimum pressure predetermined by the reference pressure, the membrane lifts off the contact pin and opens an oscillating circuit arranged in the tire pressure sensor
- Circuit can be arranged near a wheel
- the aim of the present solution is to send a signal to the evaluation circuit using simple means when a leak occurs in the reference pressure chamber.
- the tire pressure sensor according to the invention with the characteristic feature has the advantage that the membrane lifts off the contact pin even when the pressure between the reference pressure chamber and the tire pressure is equalized and thereby emits an alarm signal to the evaluation circuit, ie the contact is open in the differential pressure-free state. If the pressure equalization occurs through a leak, then If the tire is refilled after a short time (due to pressure compensation), the pressure is again low. This does not happen if the tire pressure is too low and the tank is refilled.
- Another advantage is that such a leak indicator can already be used during the manufacture of the tire pressure sensor or before it is delivered or during installation in a workshop to check the tightness of the reference pressure chamber by applying a small amount of compressed air.
- the coil and the capacitor of the tire pressure sensor are arranged in a resonant circuit chamber in relation to the signal transducer which is arranged in the vicinity of the wheel, it is expedient that the contact pin and a connecting wire of the reference pressure chamber protrude at one end through a seal into the resonant circuit chamber.
- FIG. 1 shows the section of a Vehicle races with the tire pressure sensor according to the invention inserted in the rim
- FIG. 2 shows a cross section through the tire pressure sensor according to the invention in an enlarged view
- FIG. 3 shows a greatly enlarged switching area of the membrane with the contact pin
- FIG. 4 shows the clamping point of the reference pressure chamber on the sensor housing, shown in greatly enlarged form.
- FIG. 1 the detail of a motor vehicle wheel is shown on a smaller scale in cross section and designated 10. It shows a tire 11 which is attached to a wheel rim 12.
- a tire pressure sensor 13 is screwed into a threaded bore 14 of the wheel rim 12 on an inwardly directed section of the wheel rim 12.
- a signal pickup 15 is attached to the wheel suspension of the vehicle, not shown, the end face of which is directed towards the tire pressure sensor 13 and couples a high-frequency oscillation into the tire pressure sensor 13 when it passes every turn of the vehicle wheel 10.
- the structure of the tire pressure sensor 13 is shown in Figure 2. It consists of a sensor housing 16 made of stainless steel, which has a threaded attachment 17 for attachment to the wheel rim 12.
- the sensor housing 16 is open towards the front of the tire 11.
- a sealing ring 19, a support ring 20 made of plastic, a reference pressure chamber 21 made of steel, a spacer ring 22 made of fiber plastic and a perforated cover plate 23 are inserted into the sensor housing 16 and through the ring shoulder 18 and a bead edge 24 on the front end of the sensor housing 16 clamped in this.
- an oscillating circuit chamber 25 in which an annular coil 26, a ferrite core 27, a receptacle 28 made of plastic for the ferrite core 27 and a capacitor (not recognizable) inserted therein are arranged.
- the reference pressure chamber 21 is closed off from the tire interior 11 by a flat membrane 29.
- a contact pin 30 with a glass bushing 31 is fastened in a pressure-tight and electrically insulated manner in the reference pressure chamber 21.
- the contact surface of the contact ball 32 is processed together with the annular contact surface 33 of the reference pressure chamber 21 for the membrane 29 such that the leakage test of the reference pressure chamber 21 in a depressurized state between the contact pin 30 with the contact ball 32 and the central region of the membrane 29 there is an air gap X of approximately 0.03 mm.
- this is shown by a greatly enlarged representation of the contact area between membrane 29 and contact pin 30.
- the support ring 20 has to the resonant circuit chamber 25 a through the annular shoulder 18 of the steel housing 16 projecting collar 39, which includes the lead wire 36 and the contact pin 30.
- a sealing compound 40 for example a polyurethane, is filled inside the collar 39, which surrounds the contact pin 30 and the connecting wire 36 in an airtight manner in the region of the collar 39.
- a cover cap 41 closes the resonant circuit chamber 35 from the outside by being in contact with a further sealing ring 42 at the lower end of the sensor housing 16 and being fastened to an annular shoulder 43 by a flange 44 of the sensor housing 16.
- the connecting wire 36 is contacted at its outer end with a connection 45 of the capacitor, which cannot be recognized, the other connection 46 of which is connected to one end of the ring coil 26.
- the other end of the ring coil 26 is finally contacted with the free end of the contact pin 30.
- the compressed air in the tire must completely wash it. This is achieved in that the compressed air first reaches the membrane 29 of the reference pressure chamber 21 through openings 47 in the cover plate 23. As shown in FIG. 4, the compressed air also reaches a gap 49 between the steel housing 16 and the spacer ring 22 via a radial notch 48 in the outer area on the underside of the cover plate 23 and from there to a radial trough 50 incorporated into the ring wall 38 of the support ring 20, which is open to the collar 37 of the reference pressure chamber 21. From there, the Compressed air to the back of the reference pressure chamber 21.
- the radial gap 49 between the sensor housing 16 and the spacer ring 22 is formed in that the spacer ring 20, like the collar 37 of the reference pressure chamber 21, has a smaller outside diameter than the receptacle of the sensor housing 16 in this area. This measure allows both leaks on the glass bushing 31, on the filler channel 34 and on the weld seam of the membrane 29 to be detected, by leading to pressure equalization between the compressed air in the tire on the outside of the membrane 29 and the reference pressure on the inside of the membrane 29 , so that the membrane 29 stands out from the contact pin 30 and thus interrupts the resonant circuit.
- the invention is not limited to the exemplary embodiment, since in many cases leak monitoring of the membrane weld on the reference pressure chamber is sufficient, which is already ensured by the fact that the circumferential weld seam on the membrane is reached by the compressed air in the tire.
- the contact distance and X between the contact pin and the membrane can also be different and in other ways, e.g. by upsetting the contact ball 32 after welding the membrane 29 before filling the gas into the reference pressure chamber 21. It is essential that at the same pressure on both sides of the membrane 29 this lifts from the contact pin 30 to interrupt the circuit.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Un détecteur (13) de la pression des pneus d'un véhicule comprend, pour contrôler la pression des pneus, un interrupteur manométrique actionné par la pression des pneus. L'interrupteur manométrique comprend une chambre de pression de référence (21) isolée du pneu par une membrane (29) électriquement conductrice et portant une fiche de contact (30) que touche la région centrale de la membrane lorsque la pression à l'intérieur du pneu est suffisante, en fermant un circuit électrique. Afin de déclencher un signal d'alarme lors de fuites de la chambre de pression de référence , un contrôle des fuites de la chambre de pression de référence (21) est automatiquement effectué, en ce sens que lorsque la pression est égale des deux côtés de la membrane (29), un espace sépare la fiche de contact (30) et la région centrale de la membrane (29).A vehicle tire pressure sensor (13) includes, for monitoring the tire pressure, a pressure switch actuated by the tire pressure. The pressure switch comprises a reference pressure chamber (21) isolated from the tire by an electrically conductive membrane (29) and carrying a contact plug (30) that touches the central region of the membrane when pressure inside the tire. tire is sufficient, by closing an electrical circuit. In order to trigger an alarm signal when there are leaks from the reference pressure chamber, a leakage check of the reference pressure chamber (21) is automatically carried out, in that when the pressure is equal on both sides of the membrane (29), a space separates the contact plug (30) and the central region of the membrane (29).
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3543866 | 1985-12-12 | ||
DE19853543866 DE3543866A1 (en) | 1985-12-12 | 1985-12-12 | TIRE PRESSURE SENSOR FOR MOTOR VEHICLES |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0248821A1 true EP0248821A1 (en) | 1987-12-16 |
EP0248821B1 EP0248821B1 (en) | 1989-05-03 |
Family
ID=6288240
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86906285A Expired EP0248821B1 (en) | 1985-12-12 | 1986-11-05 | Detector of the inflation pressure of motor vehicle tyres |
Country Status (5)
Country | Link |
---|---|
US (1) | US4783993A (en) |
EP (1) | EP0248821B1 (en) |
JP (1) | JPS63501864A (en) |
DE (2) | DE3543866A1 (en) |
WO (1) | WO1987003547A1 (en) |
Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3639688A1 (en) * | 1986-11-20 | 1988-05-26 | Bosch Gmbh Robert | TIRE PRESSURE SENSOR FOR MOTOR VEHICLES |
DE3813846A1 (en) * | 1988-04-23 | 1989-11-02 | Bosch Gmbh Robert | TIRE PRESSURE SENSOR FOR MOTOR VEHICLES |
DE3822662A1 (en) * | 1988-07-05 | 1990-01-11 | Bosch Gmbh Robert | PNEUMATICALLY OPERATED PRESSURE SWITCH AND METHOD FOR THE PRODUCTION THEREOF |
DE3841995C1 (en) * | 1988-12-14 | 1990-06-13 | Moto Meter Ag, 7250 Leonberg, De | Pressure switch for monitoring the pressure in the tyre of a motor vehicle wheel |
DE3926245A1 (en) * | 1989-08-09 | 1991-02-14 | Bosch Gmbh Robert | TIRE PRESSURE SENSOR FOR MOTOR VEHICLES |
DE3930813A1 (en) * | 1989-09-14 | 1991-03-28 | Wabco Westinghouse Fahrzeug | TIRE PRESSURE MONITORING DEVICE |
DE3934415A1 (en) * | 1989-10-14 | 1991-04-18 | Wabco Westinghouse Fahrzeug | DEVICE FOR MONITORING THE TIGHTNESS OF A GAS-FILLED CHAMBER |
US4954806A (en) * | 1990-01-17 | 1990-09-04 | Hwang Feng Lin | Warning device for the inadequate tire air pressure |
JPH0481309A (en) * | 1990-07-24 | 1992-03-16 | Nippondenso Co Ltd | Inflation pressure detecting device |
DE4105580C1 (en) * | 1991-02-22 | 1992-04-02 | Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De | Vehicle tyre filler valve - incorporates pressure indicator with chamber divided into two by membrane |
US5289160A (en) * | 1991-09-30 | 1994-02-22 | Fiorletta Carl A | Tire pressure monitoring system |
US5717135A (en) * | 1991-09-30 | 1998-02-10 | Carl A. Fiorletta | Tire pressure monitoring system utilizing a pressure activated transducer and sensor |
US5309969A (en) * | 1991-12-17 | 1994-05-10 | Chander Mittal | Apparatus for repeatable adjustment of tire pressure |
US5838229A (en) * | 1995-07-18 | 1998-11-17 | Schrader-Bridgeport International, Inc. | Remote tire pressure monitoring system employing coded tire identification and radio frequency transmission and enabling recalibration upon tire rotation or replacement |
US5844130A (en) | 1996-04-03 | 1998-12-01 | Ssi Technologies | Apparatus for maintaining a constant radial distance between a transmitting circuit and an antenna coil |
US7086411B2 (en) * | 2003-10-24 | 2006-08-08 | Lear Corporation | Snap-in grommet for a valve stem assembly |
US6945104B2 (en) * | 2003-10-24 | 2005-09-20 | Lear Corporation | Attachment mechanism for a tire monitoring system |
US20050087007A1 (en) * | 2003-10-24 | 2005-04-28 | Lear Corporation | Tire monitor system with spring retention clip |
US7086412B2 (en) * | 2003-10-24 | 2006-08-08 | Lear Corporation | Snap-in grommet for a valve steam assembly |
US7028541B2 (en) * | 2003-11-04 | 2006-04-18 | Lear Corporation | Tire pressure sensing component for detecting air pressure and related method |
US6952955B1 (en) | 2004-07-28 | 2005-10-11 | Lear Corporation | Adjustable mounting of tire monitoring assembly |
US6904795B1 (en) | 2004-09-14 | 2005-06-14 | Lear Corporation | Sealed mounting of tire monitoring assembly |
US7937998B2 (en) * | 2009-03-19 | 2011-05-10 | Deere & Company | Sensor mount with self-tightening device |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3185785A (en) * | 1961-04-13 | 1965-05-25 | Howard Irma Amelie | Combined inflation valve and circuitclosing mechanism for pneumatic tires |
IT998462B (en) * | 1973-08-23 | 1976-01-20 | Pirelli | RIM FOR TIRES WITH SIGNAL TRANSDUCER |
FR2308518A1 (en) * | 1975-04-21 | 1976-11-19 | Michelin & Cie | IMPROVEMENTS TO DETECTORS OF VARIATION IN TIRE INFLATION PRESSURE |
SE439463B (en) * | 1978-04-25 | 1985-06-17 | Gunter Pruss | DEVICE FOR CREATING A SIGNAL DURING THE UNDERTAKING OF AN AIR PRESSURE IN AN AIR FILLING FOR AN AIR TIRE |
DE3004493A1 (en) * | 1980-02-07 | 1981-08-13 | Continental Gummi-Werke Ag, 3000 Hannover | Measuring pressure of pneumatic vehicle tyres - using membrane transducer with compensation gas chamber and buffer chamber |
DE3507253C1 (en) * | 1985-03-01 | 1986-07-03 | Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart | Pneumatically operated pressure switch for tire pressure monitoring |
-
1985
- 1985-12-12 DE DE19853543866 patent/DE3543866A1/en not_active Withdrawn
-
1986
- 1986-11-05 US US07/095,536 patent/US4783993A/en not_active Expired - Fee Related
- 1986-11-05 JP JP61505855A patent/JPS63501864A/en active Pending
- 1986-11-05 EP EP86906285A patent/EP0248821B1/en not_active Expired
- 1986-11-05 WO PCT/DE1986/000446 patent/WO1987003547A1/en active IP Right Grant
- 1986-11-05 DE DE8686906285T patent/DE3663120D1/en not_active Expired
Non-Patent Citations (1)
Title |
---|
See references of WO8703547A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0248821B1 (en) | 1989-05-03 |
DE3663120D1 (en) | 1989-06-08 |
US4783993A (en) | 1988-11-15 |
WO1987003547A1 (en) | 1987-06-18 |
DE3543866A1 (en) | 1987-06-19 |
JPS63501864A (en) | 1988-07-28 |
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